It's realy hard to tell. Unlike smash bros. where they all seem like one big family and actually look like they belong together... These playstation all star's just look like their all thrown into a fighting game, and that's it.
Although i can see sack boy befriending everybody!
Kratos would rip off sir daniel's head as soon as he sees him, then sir dan would get back up grab his head and be like friend lol. Krato shakes his hand then sees sackboy appear out of nowhere and says by the gods what is thia little s***, then sackboy makes himself look like kratos and kratos puts him on his shoulder and says your one smooth little sack thing.